/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.lucene.analysis.icu;

import java.io.Reader;
import java.io.StringReader;
import java.util.HashMap;
import java.util.Map;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.tests.analysis.BaseTokenStreamTestCase;

/** basic tests for {@link ICUNormalizer2FilterFactory} */
public class TestICUNormalizer2FilterFactory extends BaseTokenStreamTestCase {

  /** Test nfkc_cf defaults */
  public void testDefaults() throws Exception {
    Reader reader = new StringReader("This is a Ｔｅｓｔ");
    ICUNormalizer2FilterFactory factory = new ICUNormalizer2FilterFactory(new HashMap<>());
    TokenStream stream = whitespaceMockTokenizer(reader);
    stream = factory.create(stream);
    assertTokenStreamContents(stream, new String[] {"this", "is", "a", "test"});
  }

  /** Test nfkc form */
  public void testFormArgument() throws Exception {
    Reader reader = new StringReader("This is a Ｔｅｓｔ");
    Map<String, String> args = new HashMap<>();
    args.put("form", "nfkc");
    ICUNormalizer2FilterFactory factory = new ICUNormalizer2FilterFactory(args);
    TokenStream stream = whitespaceMockTokenizer(reader);
    stream = factory.create(stream);
    assertTokenStreamContents(stream, new String[] {"This", "is", "a", "Test"});
  }

  /** Test nfkc_scf form */
  public void testSimpleCaseFold() throws Exception {
    // example from https://www.w3.org/TR/charmod-norm/#dfn-unicode-simple
    Reader reader = new StringReader("ᾛ");
    Map<String, String> args = new HashMap<>();
    args.put("form", "nfkc_scf");
    ICUNormalizer2FilterFactory factory = new ICUNormalizer2FilterFactory(args);
    TokenStream stream = whitespaceMockTokenizer(reader);
    stream = factory.create(stream);
    assertTokenStreamContents(stream, new String[] {"ᾓ"});
  }

  /** Test that bogus arguments result in exception */
  public void testBogusArguments() throws Exception {
    IllegalArgumentException expected =
        expectThrows(
            IllegalArgumentException.class,
            () -> {
              new ICUNormalizer2FilterFactory(
                  new HashMap<String, String>() {
                    {
                      put("bogusArg", "bogusValue");
                    }
                  });
            });
    assertTrue(expected.getMessage().contains("Unknown parameters"));
  }

  // TODO: add tests for different forms
}
